초록 ▼

An apparatus and method are herein disclosed for measuring interference patterns and interferograms using a standard monochrome closed-circuit television camera. The invention comprises, in one embodiment, means for processing the video output signal of the CCTV camera to obtain the two-dimensional

An apparatus and method are herein disclosed for measuring interference patterns and interferograms using a standard monochrome closed-circuit television camera. The invention comprises, in one embodiment, means for processing the video output signal of the CCTV camera to obtain the two-dimensional coordinates for an array of points located on the centers of the interference fringes in one TV frame. The fringe centers are determined from the first and second derivatives of the video output signal of the CCTV camera. The coordinates are then ordered based on their average values in one direction, and the ordered coordinates are then processed in a computer to provide the desired least-squares reduction of the fringe pattern.

대표청구항 ▼

An apparatus for measuring an interference fringe pattern rapidly and accurately comprising means for putting said fringe pattern into a CCTV system including a camera and a monitor, meaNs for displaying said fringe pattern on said monitor, means for processing the video output of said camera includ

An apparatus for measuring an interference fringe pattern rapidly and accurately comprising means for putting said fringe pattern into a CCTV system including a camera and a monitor, meaNs for displaying said fringe pattern on said monitor, means for processing the video output of said camera including means to count the number of fringes on the pattern in one TV frame, means to track at least one fringe per TV frame to establish measurement windows along said fringe, means to sense the fringe centers from the first and second derivative of the video output of said camera, means including an oscillator to measure the two dimensional coordinates for an array of points located on all of the fringe centers falling within said measurement windows within a single TV frame, and also including means for ordering said coordinates of said fringe centers based on their average value in one direction and for processing the ordered coordinates to provide a least-squares reduction of said fringe pattern.